Flatbedford said:
I want a full size 4x4 pickup with a diesel engine with similar power and torque output as the 300 cid inline six that my '83 Ford F250 had. I think it was rated at about 120 hp and 200 ftlb torque. .
GM tried it starting in 1982 up to early 90s and sales were lousy. GM is the only one that made an effort to put a low power diesel for their own design in a full-size half-ton truck.
I suspect one problem is that USA-Americans seem convinced that diesels are more powerful than gas engines - and actually it's the opposite. I know when the 6.2 (378 c.i.) diesels came out, many new owners thought they ought to have more power then 350 gasers instead of less. Seems even today, many still believe the "more power" myth. Even the story about diesels having more torque is not true. Take a gas engine and a diesel engine with the same bore and stroke and the gas will have more horsepower, and more or equal torque at the same RPMs. It just so happens that since diesels are usually made for HD use, they tend to have long stroke versus smaller bore -which makes torque. Gas engines in cars are usually oposite. Big bore and short stroke to make high RPMs.
In the auto industry, it is rare to find a gas and diesel with the same bore and stroke, It is very comon though with farm tractors and all the test specs are around to be read. As I recall, the only engine made by one of the big three that came as gas or diesel was the late 70s, early 80s Oldsmobile 350. Same bore and stroke for each and the gas version had more horsepower and more torque. Isuzu and Nissan also did it, but just with small engines. 1.8 Isuzu diesel used in Chevy Chevettes and Isuzu Imarks was also available in gas version.
The 6.2 V8 diesel that Detroit Diesel designed for GM was intended to be an equal power replacement for the 305 c.i. gas engine. 136 max. horse and 240 lbs. of torque at 2000 RPM. Just about exactly the same max horse and torque as the 305, but could get 20 MPG instead of 14 MPG.
A few others tried but did even worse. Jeep with a Perkins diesel in the 60s, Dodge tried one year (1978) with a small 6 cylinder Mistubishi diesel, etc.
I don't believe anything has changed today. Low power vehicles made for utilty and fuel economy always fail in the USA except during times of crisis.
305 (5 liter) GM V8 gas engine - 140 horse at 4000 RPM and 235 lbs. torque at 2000 RPM.
378 (6.2 liter) GM V8 diesel engine - 130 horse at 3600 RPM and 240 lbs. torque at 2000 RPM.
300 (5 liter) Ford 300 in-line six - 115 horse at 3000 RPM and 223 lbs. torque as 1600 RPM.
243 (3.9 liter) Dodge-Mitsubishi in-line six - 100 horse at 3700 RPM and 165 lbs. torque at 2200 RPM.